contrib/subtree: fix "unsure" for --message in the document

Revise the documentation and remove previous "unsure" after making sure
that --message supports only 'add', 'merge', 'pull', and 'split --rejoin'.

Signed-off-by: Danny Lin <danny0838@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/contrib/subtree/git-subtree.txt b/contrib/subtree/git-subtree.txt
index 352deda69dcfd009ff025615dff07dd0a5d015d1..9ccd431c7ffb223e6df9f825cf050b4ae9ddbdc1 100644 (file)
--- a/contrib/subtree/git-subtree.txt
+++ b/contrib/subtree/git-subtree.txt
@@ -139,7 +139,7 @@ OPTIONS
 
 -m <message>::
 --message=<message>::
-       This option is only valid for add, merge and pull (unsure).
+       This option is only valid for add, merge, pull, and split --rejoin.
        Specify <message> as the commit message for the merge commit.